A magnetic recording medium and method for forming the magnetic recording medium are described. The magnetic recording medium includes a magnetic layer formed on a non-magnetic support, and a lubricant layer over the magnetic layer. The lubricant layer includes a compound selected from the group consisting of hydrocarbyl-substituted cyclopentanes, hydrocarbyl-substituted cyclopentenes, hydrocarbyl-substituted cyclopentadienes, and mixtures or derivatives thereof. The lubricant layer also may be used on a magnetic head for reading and writing information on a magnetic recording medium. The magnetic recording medium and the magnetic head may be used to manufacture computer disk drives, compact disk drives, audio equipment, and video equipment.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A magnetic recording medium, comprising: a non-magnetic support; a magnetic layer formed on the support; and a lubricant layer over the magnetic layer, the lubricant layer including a hydrocarbyl subsituted cyclopentane selected from the group consisting of tris-(2-octyldodecyl)cyclopentane, di-(2-octyldodecyl)cyclopentane, and tetra-(2-octyldodecyl )cyclopentane thereof, wherein said lubricant layer comprises from about 0.055 wt % to about 0.22 wt % of said hydrocarbyl substituted cyclopentane.
2. The magnetic recording medium of claim 1 , further comprising a protective layer between the magnetic layer and the lubricant layer.
3. The magnetic recording medium of claim 2 , wherein the lubricant layer further comprises one or more additives.
4. The magnetic recording medium of claim 3 , wherein the additives are cyclic phosphazenes, metallic soaps, fatty acids, amides, fatty acid esters, higher aliphatic alcohols, monoalkyl phosphates, dialkyl phosphates, trialkyl phosphates, paraffins, silicone oils, animal oils, vegetable oils, mineral oils, higher aliphatic amines, inorganic fine powders, resin fine powders, unsaturated aliphatic hydrocarbons, or a mixture thereof.
5. The magnetic recording medium of claim 2 , wherein the lubricant layer includes a mixture of two or more lubricants; wherein one lubricant is a hydrocarbyl-substituted cyclopentane that is not functionalized and another lubricant is a hydrocarbyl-substituted cyclopentane that is functionalized.
6. The magnetic recording medium of claim 1 , wherein the lubricant layer further comprises one or more additives.
7. The magnetic recording medium of claim 6 , wherein the additives are cyclic phosphazenes, metallic soaps, fatty acids, amides, fatty acid esters, higher aliphatic alcohols, monoalkyl phosphates, dialkyl phosphates, trialkyl phosphates, paraffins, silicone oils, animal oils, vegetable oils, mineral oils, higher aliphatic amines, inorganic fine powders, resin fine powders, unsaturated aliphatic hydrocarbons, or a mixture thereof.
8. The magnetic recording medium of claim 1 , wherein the lubricant layer including a mixture of two or more lubricants; one lubricant is a hydrocarbyl-substituted cyclopentane which is not functionalized, another lubricant is a hydrocarbyl-substituted cyclopentane which is functionalized.
9. The magnetic recording medium of claim 1 , wherein said lubricant layer comprises from about 0.055 wt. % to about 0.22 wt. % of tris-(2-octyldodecyl)cyclopentane.
10. The magnetic recording medium of claim 1 , wherein said lubricant layer comprises from about 0.055 wt. % to about 0.22 wt. % of di-(2-octyldodecyl)cyclopentane.
11. The magnetic recording medium of claim 1 , wherein said lubricant layer comprises from about 0.055 wt. % to about 0.22 wt. % of tetra-(2-octyldodecyl)cyclopentane.
12. A magnetic head, comprising: a head; and a lubricant layer over at least a portion of the head, the lubricant layer comprising a hydrocarbyl substituted cyclopentane selected from the group consisting of tris-(2-octyldodecyl)cyclopentane, di-(2-octyldodecyl )cyclopentane, and tetra-(2-octyldodecyl)cyclopentane wherein said lubricant layer comprises from about 0.055 wt % to about 0.22 wt % of said hydrocarbyl substituted cyclopentane.
13. The magnetic head of claim 12 , wherein said lubricant layer comprises from about 0.055 wt. % to about 0.22 wt. % of tris-(2-octyldodecyl)cyclopentane.
14. The magnetic head of claim 12 , wherein said lubricant layer comprises from about 0.055 wt. % to about 0.22 wt. % of di-(2-octyldodecyl)cyclopentane.
15. The magnetic head of claim 12 , wherein said lubricant layer comprises from about 0.055 wt. % to about 0.22 wt. % of tetra-(2-octyldodecyl)cyclopentane.
16. A data storage/retrieval device, comprising: a magnetic recording medium including a magnetic layer over a support and a lubricant layer over the magnetic layer, the lubricant layer comprising a hydrocarbyl substituted cyclopentane selected from the group consisting of tris-(2-octyldodecyl )cyclopentane, di-(2-octyldodecyl )cyclopentane, and tetra-(2-octyldodecyl)cyclopentane; and a magnetic head adjacent to the magnetic recording medium, the magnetic head sliding on the magnetic recording medium to read and write information on the magnetic recording medium wherein said lubricant layer comprises from about 0.055 wt % to about 0.22 wt % of said hydrocarbyl substituted cyclopentane.
17. The data storage/retrieval device of claim 16 , further comprising: a power supply for applying a voltage across the magnetic recording medium and the magnetic head for reading or writing information on the magnetic recording medium.
18. The data storage/retrieval device of claim 16 , wherein the device is a computer disk drive.
19. A computer, comprising: a CPU; a disk drive connected to the CPU so that the disk drive can communicate with the CPU, the disk drive including: a magnetic recording medium having a magnetic layer over a support and a lubricant layer over the magnetic layer, the lubricant layer comprising a hydrocarbyl substituted cyclopentane selected from the group consisting of tris-(2-octyldodecyl )cyclopentane, di-(2-octyldodecyl )cyclopentane, and tetra-(2-octyldodecyl)cyclopentane; and a magnetic head adjacent to the magnetic recording medium, the magnetic head sliding on the magnetic recording medium to read and write information on the magnetic recording medium wherein said lubricant layer comprises from about 0.055 wt % to about 0.22 wt % of said hydrocarbyl substituted cyclopentane.
20. A method of manufacturing a magnetic recording medium, comprising: providing a non-magnetic support; forming a magnetic layer on the support; and forming a lubricant layer over the magnetic layer, the lubricant layer comprising a hydrocarbyl substituted cyclopentane selected from the group consisting of tris-(2-octyldodecyl )cyclopentane, di-(2-octyldodecyl )cyclopentane, and tetra-(2-octyldodecyl)cyclopentane wherein said lubricant layer comprises from about 0.055 wt % to about 0.22 wt % of said hydrocarbyl substituted cyclopentane.
21. The method of claim 20 , further comprising: forming a protective layer on the magnetic layer between the lubricant layer and the magnetic layer.
22. The method of claim 20 , wherein said lubricant layer comprises from about 0.055 wt. % to about 0.22 wt. % of di-(2-octyldodecyl)cyclopentane.
23. The method of claim 20 , wherein said lubricant layer comprises from about 0.055 wt. % to about 0.22 wt. % of tetra-(2-octyldodecyl)cyclopentane.
24. The method of claim 20 , wherein said recording medium has a number of cycles to failure greater than about 10,000.
25. The method of claim 24 , wherein said recording medium has a number of cycles to failure greater than about 60,000.
26. A method of manufacturing a magnetic recording medium, comprising: providing a non-magnetic support; forming a magnetic layer on the support; and forming a lubricant layer over the magnetic layer, said lubricant layer comprising from about 0.055 wt. % to about 0.22 wt. % of tris-(2-octyldodecyl)cyclopentane.
27. The method of claim 26 , wherein said recording medium has a number of cycles to failure greater than about 60,000.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
October 18, 2005
July 17, 2007
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